Malicious PDF — malware analysis report

Static analysis result for SHA-256 52128e886d75a1f1…

MALICIOUS

PDF

72.3 KB Created: 2021-09-24 15:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ff093d8216d95bf7e7738daf56885f4 SHA-1: cdfc6fcc4584e47fc4fe67644151e32839771dbf SHA-256: 52128e886d75a1f12f800eefa01c0ed86d0ca62867a901f767d5af6dab5f0e29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a large number of external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it is used as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=comparatives+and+superlatives+exercises+pdf PDF link annotation
    • http://posuni.com/userfiles/file/luwukof.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/51953742614.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210901/file/95789499918.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/38149222199.pdfIn PDF document text
    • https://umartravel.com/files/norovob.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/radorobigosezeko.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/kofugewifewavolofixolelu.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/17433296797.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/00pqsg80veo1q69t84trji2git/xukux.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/85391268595.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f6e38e9fead432e9f07926d0879a61be/warazijiraporinamuf.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/teketiditifadikuwor.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109192353549715.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/36037320671.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/77592439424.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614627dbb07dd---97683432275.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147f30d856f8---57427892692.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/48231072619.pdfIn PDF document text
    • http://favourtec.com/attachment/file/kagevafanosisodo.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/madipaneliputim.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137c8f98eb88---vumaranix.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/fezinugawanebab.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/52352608600.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/21hmtl73jgd3okghvv1aiursfj/61495571631.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145b191720e6---dutegokogiril.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF2 17412 bytes
SHA-256: b50489c3831ee76a551298861d09a9dadff8cf0ff1627b029704ed6f69488004
font_02_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 11080 bytes
SHA-256: eeaa1e6731d5f3d2e1d3733046120f36075c4e1d7630a940cbc8009380d11cad

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